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<pre><span class="sourceLineNo">001</span>package org.apache.commons.net.ntp;<a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.3"></a>
<span class="sourceLineNo">004</span> * contributor license agreements.  See the NOTICE file distributed with<a name="line.4"></a>
<span class="sourceLineNo">005</span> * this work for additional information regarding copyright ownership.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.6"></a>
<span class="sourceLineNo">007</span> * (the "License"); you may not use this file except in compliance with<a name="line.7"></a>
<span class="sourceLineNo">008</span> * the License.  You may obtain a copy of the License at<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<span class="sourceLineNo">011</span> *<a name="line.11"></a>
<span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a>
<span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a>
<span class="sourceLineNo">017</span> */<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>/***<a name="line.20"></a>
<span class="sourceLineNo">021</span> * Common NtpUtils Helper class.<a name="line.21"></a>
<span class="sourceLineNo">022</span> *<a name="line.22"></a>
<span class="sourceLineNo">023</span> * @author Jason Mathews, MITRE Corp<a name="line.23"></a>
<span class="sourceLineNo">024</span> *<a name="line.24"></a>
<span class="sourceLineNo">025</span> * @version $Revision: 1299238 $<a name="line.25"></a>
<span class="sourceLineNo">026</span> */<a name="line.26"></a>
<span class="sourceLineNo">027</span>public final class NtpUtils {<a name="line.27"></a>
<span class="sourceLineNo">028</span><a name="line.28"></a>
<span class="sourceLineNo">029</span>    /***<a name="line.29"></a>
<span class="sourceLineNo">030</span>      * Returns 32-bit integer address to IPv4 address string "%d.%d.%d.%d" format.<a name="line.30"></a>
<span class="sourceLineNo">031</span>      *<a name="line.31"></a>
<span class="sourceLineNo">032</span>      * @param address  the 32-bit address<a name="line.32"></a>
<span class="sourceLineNo">033</span>      * @return  the raw IP address in a string format.<a name="line.33"></a>
<span class="sourceLineNo">034</span>      */<a name="line.34"></a>
<span class="sourceLineNo">035</span>     public static String getHostAddress(int address)<a name="line.35"></a>
<span class="sourceLineNo">036</span>     {<a name="line.36"></a>
<span class="sourceLineNo">037</span>          return ((address &gt;&gt;&gt; 24) &amp; 0xFF) + "." +<a name="line.37"></a>
<span class="sourceLineNo">038</span>                 ((address &gt;&gt;&gt; 16) &amp; 0xFF) + "." +<a name="line.38"></a>
<span class="sourceLineNo">039</span>                 ((address &gt;&gt;&gt;  8) &amp; 0xFF) + "." +<a name="line.39"></a>
<span class="sourceLineNo">040</span>                 ((address &gt;&gt;&gt;  0) &amp; 0xFF);<a name="line.40"></a>
<span class="sourceLineNo">041</span>     }<a name="line.41"></a>
<span class="sourceLineNo">042</span><a name="line.42"></a>
<span class="sourceLineNo">043</span>    /***<a name="line.43"></a>
<span class="sourceLineNo">044</span>     * Returns NTP packet reference identifier as IP address.<a name="line.44"></a>
<span class="sourceLineNo">045</span>     *<a name="line.45"></a>
<span class="sourceLineNo">046</span>     * @param packet  NTP packet<a name="line.46"></a>
<span class="sourceLineNo">047</span>     * @return  the packet reference id (as IP address) in "%d.%d.%d.%d" format.<a name="line.47"></a>
<span class="sourceLineNo">048</span>     */<a name="line.48"></a>
<span class="sourceLineNo">049</span>     public static String getRefAddress(NtpV3Packet packet)<a name="line.49"></a>
<span class="sourceLineNo">050</span>     {<a name="line.50"></a>
<span class="sourceLineNo">051</span>         int address = (packet == null) ? 0 : packet.getReferenceId();<a name="line.51"></a>
<span class="sourceLineNo">052</span>         return getHostAddress(address);<a name="line.52"></a>
<span class="sourceLineNo">053</span>     }<a name="line.53"></a>
<span class="sourceLineNo">054</span><a name="line.54"></a>
<span class="sourceLineNo">055</span>    /***<a name="line.55"></a>
<span class="sourceLineNo">056</span>     * Get refId as reference clock string (e.g. GPS, WWV, LCL). If string is<a name="line.56"></a>
<span class="sourceLineNo">057</span>     * invalid (non-ASCII character) then returns empty string "".<a name="line.57"></a>
<span class="sourceLineNo">058</span>     * For details refer to the &lt;A HREF="http://www.eecis.udel.edu/~mills/ntp/html/refclock.html#list"&gt;Comprehensive<a name="line.58"></a>
<span class="sourceLineNo">059</span>     * List of Clock Drivers&lt;/A&gt;.<a name="line.59"></a>
<span class="sourceLineNo">060</span>     *<a name="line.60"></a>
<span class="sourceLineNo">061</span>     * @param message<a name="line.61"></a>
<span class="sourceLineNo">062</span>     * @return reference clock string if primary NTP server<a name="line.62"></a>
<span class="sourceLineNo">063</span>     */<a name="line.63"></a>
<span class="sourceLineNo">064</span>    public static String getReferenceClock(NtpV3Packet message) {<a name="line.64"></a>
<span class="sourceLineNo">065</span>        if (message == null) {<a name="line.65"></a>
<span class="sourceLineNo">066</span>            return "";<a name="line.66"></a>
<span class="sourceLineNo">067</span>        }<a name="line.67"></a>
<span class="sourceLineNo">068</span>        int refId = message.getReferenceId();<a name="line.68"></a>
<span class="sourceLineNo">069</span>        if (refId == 0) {<a name="line.69"></a>
<span class="sourceLineNo">070</span>            return "";<a name="line.70"></a>
<span class="sourceLineNo">071</span>        }<a name="line.71"></a>
<span class="sourceLineNo">072</span>        StringBuilder buf = new StringBuilder(4);<a name="line.72"></a>
<span class="sourceLineNo">073</span>        // start at highest-order byte (0x4c434c00 -&gt; LCL)<a name="line.73"></a>
<span class="sourceLineNo">074</span>        for (int shiftBits = 24; shiftBits &gt;= 0; shiftBits -= 8)<a name="line.74"></a>
<span class="sourceLineNo">075</span>        {<a name="line.75"></a>
<span class="sourceLineNo">076</span>            char c = (char) ((refId &gt;&gt;&gt; shiftBits) &amp; 0xff);<a name="line.76"></a>
<span class="sourceLineNo">077</span>            if (c == 0) { // 0-terminated ASCII string<a name="line.77"></a>
<span class="sourceLineNo">078</span>                break;<a name="line.78"></a>
<span class="sourceLineNo">079</span>            }<a name="line.79"></a>
<span class="sourceLineNo">080</span>            if (!Character.isLetterOrDigit(c)) {<a name="line.80"></a>
<span class="sourceLineNo">081</span>                return "";<a name="line.81"></a>
<span class="sourceLineNo">082</span>            }<a name="line.82"></a>
<span class="sourceLineNo">083</span>            buf.append(c);<a name="line.83"></a>
<span class="sourceLineNo">084</span>        }<a name="line.84"></a>
<span class="sourceLineNo">085</span>        return buf.toString();<a name="line.85"></a>
<span class="sourceLineNo">086</span>    }<a name="line.86"></a>
<span class="sourceLineNo">087</span><a name="line.87"></a>
<span class="sourceLineNo">088</span>    /***<a name="line.88"></a>
<span class="sourceLineNo">089</span>     * Return human-readable name of message mode type (RFC 1305).<a name="line.89"></a>
<span class="sourceLineNo">090</span>     *<a name="line.90"></a>
<span class="sourceLineNo">091</span>     * @param mode<a name="line.91"></a>
<span class="sourceLineNo">092</span>     * @return mode name<a name="line.92"></a>
<span class="sourceLineNo">093</span>     */<a name="line.93"></a>
<span class="sourceLineNo">094</span>    public static String getModeName(int mode)<a name="line.94"></a>
<span class="sourceLineNo">095</span>    {<a name="line.95"></a>
<span class="sourceLineNo">096</span>        switch (mode) {<a name="line.96"></a>
<span class="sourceLineNo">097</span>            case NtpV3Packet.MODE_RESERVED:<a name="line.97"></a>
<span class="sourceLineNo">098</span>                return "Reserved";<a name="line.98"></a>
<span class="sourceLineNo">099</span>            case NtpV3Packet.MODE_SYMMETRIC_ACTIVE:<a name="line.99"></a>
<span class="sourceLineNo">100</span>                return "Symmetric Active";<a name="line.100"></a>
<span class="sourceLineNo">101</span>            case NtpV3Packet.MODE_SYMMETRIC_PASSIVE:<a name="line.101"></a>
<span class="sourceLineNo">102</span>                return "Symmetric Passive";<a name="line.102"></a>
<span class="sourceLineNo">103</span>            case NtpV3Packet.MODE_CLIENT:<a name="line.103"></a>
<span class="sourceLineNo">104</span>                return "Client";<a name="line.104"></a>
<span class="sourceLineNo">105</span>            case NtpV3Packet.MODE_SERVER:<a name="line.105"></a>
<span class="sourceLineNo">106</span>                return "Server";<a name="line.106"></a>
<span class="sourceLineNo">107</span>            case NtpV3Packet.MODE_BROADCAST:<a name="line.107"></a>
<span class="sourceLineNo">108</span>                return "Broadcast";<a name="line.108"></a>
<span class="sourceLineNo">109</span>            case NtpV3Packet.MODE_CONTROL_MESSAGE:<a name="line.109"></a>
<span class="sourceLineNo">110</span>                return "Control";<a name="line.110"></a>
<span class="sourceLineNo">111</span>            case NtpV3Packet.MODE_PRIVATE:<a name="line.111"></a>
<span class="sourceLineNo">112</span>                return "Private";<a name="line.112"></a>
<span class="sourceLineNo">113</span>            default:<a name="line.113"></a>
<span class="sourceLineNo">114</span>                return "Unknown";<a name="line.114"></a>
<span class="sourceLineNo">115</span>        }<a name="line.115"></a>
<span class="sourceLineNo">116</span>    }<a name="line.116"></a>
<span class="sourceLineNo">117</span><a name="line.117"></a>
<span class="sourceLineNo">118</span>}<a name="line.118"></a>




























































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